is 2 22171511 - 1
has 6674290 decimal digits
takes 16.167 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L771019D0E8DB942Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274172.557766.2162%25500059925000.60012.5728%173.157867.0854%0.8692%
PrimeNet2650.329161.5385%10000032000000.28435.1459%0.613463.5177%1.9792%
GPU722695.384763.7681%17000050000000.45803.9713%5.842765.2070%1.4389%
Difference+5+167.1730+2.4481%+85000+992500+0.1421-1.3985%+167.3152+1.8784%+1.8784%

Known prime factors:
No known factors for M22171511

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-23T00:00:00ANONYMOUSv4_computers2550005992500---0.600--2.573%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-04-10T00:00:00Thomas Mullenv4_computers256257--0.000--
2003-02-24T00:00:00ANONYMOUSv4_computers21267--1.340--
2017-05-02T00:47:10ramgeisManual testing267268--1.348--
2017-07-21T08:55:10ramgeisManual testing268269--2.696--
2017-07-21T08:55:10ramgeisManual testing269270--5.393--
2021-09-06T17:15:14TheJudgerManual testing270271--10.79--
2021-09-06T17:15:15TheJudgerManual testing271272--21.57--
2021-09-06T17:15:15TheJudgerManual testing272273--43.14--
2021-09-16T20:38:08TheJudgerManual testing273274--86.28--


ECM factoring results:
No ECM results for M22171511


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-01-27T00:00:00ANONYMOUSv4_computers41738A3AE2CA2F__16.17
2009-11-21T10:14:00zampelgo060647771019D0E8DB942F16.17
2010-11-18T19:27:00Carsten Kossendeyleela771019D0E8DB942F16.17


PRP results:
No PRP results for M22171511


P-1 factor-bounds graph:
B1 = 255000, B2 = 5992500 (P-1 stage 2)
B1 = 255000 (P-1 stage 1)
104
105
106
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
267
257
250
260
270
280
290
2100
Last modified: 2021-09-16T20:38:08+00:00